/Engine/Source/Runtime/Engine/Classes/GameFramework/Actor.h
including the ones added via the BP editor (whichAActor.GetComponentsfails to return).
template<typename TComponentClass, typename> static void ForEachComponentOfActorClassDefault ( const [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [AActor](API\Runtime\Engine\GameFramework\AActor) > & InActorClass, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool(const TComponentClass *)> InFunc )